<template>
  <div>
    <!--面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管路</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
        <!-- 警告区域 -->
        <el-alert  show-icon title="注意: 只允许为第三级分类设置相关参数！" type="warning"  close-text="知道了"></el-alert>
        <!-- 先择商品分类区域 -->
        <el-row class="cat_opt">
            <el-col>
                <span>选择商品分类 : </span>
                    <!-- 选择商品分类的级联选择框 -->
                    <!-- options: 数据源;  -->
                    <el-cascader expand-trigger="hover" :options="catelist" :props="cateProps" v-model="selectCateKeys" @change="handleChange"></el-cascader>
            </el-col> 
        </el-row>
        
        <!-- tab 页签区域 -->
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
            <!-- 添加动态参数的面板 -->
            <el-tab-pane label="动态参数" name="many">
                <!-- 添加参数的按钮 -->
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true" >添加参数</el-button>
                <!-- 动态参数表格 -->
                <el-table :data="manyTableData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type="expand" >
                        <!-- 循环渲染Tag标签 -->
                        <template slot-scope="scope">
                            <el-tag v-for="(item, index) in scope.row.attr_vals" :key="index" closable @close="handleClose(index, scope.row)">
                                {{item}}
                            </el-tag>
                            <!-- 输入文本框 -->
                            <el-input id="input-new-tag" v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                
                                >
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)" style=" margin-left:5px ">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引类 -->
                    <el-table-column type="index"></el-table-column>
                    <el-table-column lable="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column lable="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)" >删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
            <!-- 添加静态属相的面板 -->
            <el-tab-pane label="静态属性" name="only">
                <!-- 添加属性的按钮 -->
                <el-button type="primary" :disabled="isBtnDisabled" size="mini"  @click="addDialogVisible = true">添加属性</el-button>
                <!-- 静态属性表格 -->
                <el-table :data="onlyTableData" border stripe>
                    <!-- 展开行 -->
                                        <el-table-column type="expand" >
                        <!-- 循环渲染Tag标签 -->
                        <template slot-scope="scope">
                            <el-tag v-for="(item, index) in scope.row.attr_vals" :key="index" closable @close="handleClose(index, scope.row)">
                                {{item}}
                            </el-tag>
                            <!-- 输入文本框 -->
                            <el-input id="input-new-tag" v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                
                                >
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)" style=" margin-left:5px ">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引类 -->
                    <el-table-column type="index"></el-table-column>
                    <el-table-column lable="属性名称" prop="attr_name"></el-table-column>
                    <el-table-column lable="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
          
        </el-tabs>
    </el-card>
      <!-- 添加参数参数对话框 -->
      <el-dialog :title="'添加'+ titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
        
        <el-form :model="addForm" :rules="addFromRules" ref="addFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
        </el-dialog>

        <!--修改参数的对话框  -->
        <el-dialog :title="'修改'+ titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
        
        <el-form :model="editForm" :rules="editFromRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
        </el-dialog>
  </div>
</template>

<script>
export default {
    data() {
        return {
            // 商品分类列表
            catelist: [],
            // 级联选择框的配置对象 
            cateProps: {
                // value: 指定选中的值; lable: 所看到的值; childeren:父子节点的嵌套属性 
                value: "cat_id",
                label: "cat_name",
                children: "children"
            },
            // 级联选择框双向绑定的数组 
            selectCateKeys: [],
            // 被激活的页签的名称 
            activeName: "many",
            // 动态参数数据 
            manyTableData: [],
            // 静态参数数据 
            onlyTableData: [],
            // 控制添加对话框的显示与隐藏
            addDialogVisible: false,
            // 添加参数表单的数据对象 
            addForm: {
                attr_name: ""
            },
            // 添加表单验证规则的对象
            addFromRules: {
                attr_name: [
                    {  required: true, message: '请输入参数名称', trigger: 'blur' }
                ]
            },
            // 控制修改对话框的显示与隐藏 
            editDialogVisible: false,

            // 修改的表单数据对象 
            editForm: {},
            // 修改表单的验证规则对象  
            editFromRules: {
                attr_name: [
                    {  required: true, message: '请输入参数名称', trigger: 'blur' }
                ]
            },
            // // 控制按钮与文本框的切换显示 
            // inputVisible : false,
            // // 文本框中输入的内容 
            // inputValue: ""
        }
    },

    created() {
        this.getCateList()
    },

    methods: {
        // 获取所有分类列表
        async getCateList() {
           const {data: res} =  await this.$http.get('categories')
           if(res.meta.status !== 200 ) {
               return this.$message.error("获取商品分类失败！")
           }
           this.catelist = res.data
           // console.log(this.catelist)
        },
        // 级联选择框中的变化, 会触发这个函数
        handleChange() {
            this.getParamsData()
        },
        // 获取参数列表 
        async getParamsData() {
            // 证明选中的不是三级分类
            if (this.selectCateKeys.length !== 3) {
                this.selectCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            // 证明选中的是三级分类
            // 根据所选分类id, 和当前所处的面板 获取对应的参数    
            // console.log(this.cateId, this.activeName);
            const { data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, { params: {sel: this.activeName} })  
          
            if ( res.meta.status !== 200) {
                 return this.$message.error("获取参数列表失败！")
            }
            res.data.forEach(item => {
                // 防止空页签的渲染
                item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : []
                
                // 控制文本框的显示与隐藏 [{},{}] 添加属性
                item.inputVisible = false
                // 文本框中输入的值 
                item.inputValue = ""
            })
            console.log(res.data);
            // 区分动态参数与静态参数 
            if (this.activeName === "many") {
                this.manyTableData = res.data
            }else {
                this.onlyTableData = res.data
            }
        },

        // Tab 页签点击事件的处理函数 
        handleTabClick() {
            // console.log(this.activeName);
            this.getParamsData()
        },
        // 添加对话框的关闭事件
        addDialogClosed() {
            this.$refs.addFormRef.resetFields()
        },
        // 点击按钮添, 添加参数 
        addParams() {
            this.$refs.addFormRef.validate( async valid => {
                if (!valid) return 
                const { data:res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                })
                if (res.meta.status !== 201) {
                    return this.$message.error("添加参数失败！！")
                }
                this.$message.success("添加参数成功！！")
                this.addDialogVisible = false
                this.getParamsData()
            })
        },
        // 点击按钮, 展示修改的对话框 
        async showEditDialog(attr_id) {
            // 查询当前参数的信息 
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, { params: {attr_sel: this.activeName} })
            this.editDialogVisible = true
            if (res.meta.status !== 200) {
                return this.$message.error('获取参数信息失败！！')
            }
            this.editForm = res.data
        },
        // 重置修改的表单
        editDialogClosed() {
            this.$refs.editFormRef.resetFields()
        },
        // 点击按钮修改信息 
        editParams() {
            this.$refs.editFormRef.validate(async valid => {
                if (!valid) return
                const { data:res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
                    attr_name: this.editForm.attr_name, attr_sel: this.activeName
                })
               
                if (res.meta.status !== 200) {
                    return this.$message.error('修改参数失败！！')
                }
                this.$message.success("修改参数成功！！")
                this.getParamsData()
                this.editDialogVisible = false
            })
        },
        // 根据id 是删除对应的参数项
        async removeParams( attr_id ) {
            const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
            }).catch(error => error)
            // 用户取消的删除操作 
            if(confirmResult !== "confirm") {
                return this.$message.info("已取消删除！！")
            }
            // 删除业务逻辑
            const { data: res } =  await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
            if(res.meta.status !== 200) {
                return this.$message.error("删除参数失败！！")
            }
            this.$message.success("删除参数成功！！")
            this.getParamsData()
        },
        // 文本框失去了焦点或摁下了 Enter 都会触发
        async handleInputConfirm(row) {
            // 文本框与按钮的切换,输入数据的条件判断 
            if(row.inputValue.trim().length === 0) {
                row.inputValue = ""
                row.inputVisible = false
                return
            }
            // 如果没有 return 则输入的内容, 需要做后续的处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ""
            row.inputVisible = false
            // 需要发起请求, 保存这次操作 
            this.saveAttrVals(row)
        },
        // 将对 attr_vals 的操作保存到数据库 
        async saveAttrVals(row) {
           const {data: res } =  await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(" ")
            })
            if (res.meta.status !== 200) {
                return this.$message.error("修改参数项失败！！")
            }
            this.$message.success("修改参数项成功！！") 
        },

        // 点击按钮， 显示文本输入框
        showInput(row) {
            row.inputVisible = true
            // 让文本框自定获取焦点
            // $nextTick 方法的作用: 就是当页面元素被重新渲染之后, 才会指定回掉函数中的代码
            // dom元素更新是异步的 $nextTick()执行异步完成的回掉
            this.$nextTick(_ => {
                // this.$refs.saveTagInput.$refs.input: 获取input dom节点, focus(): 获取焦点函数 
                this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        // 删除对应的可选项
        handleClose(index, row) {
            row.attr_vals.splice(index, 1)
            this.saveAttrVals(row)
        }
    },
    computed: {
        // 如果按钮需要被禁用则返回True，否则返回fales
        isBtnDisabled() {
            if (this.selectCateKeys.length !== 3){
                return true
            }
            return false
        },
        // 当前选中的三级分类的Id
        cateId() {  
            if( this.selectCateKeys.length === 3){
                // 获取数组最后的元素 
                return this.selectCateKeys[2]
            }
            return null 
        },
        // 动态计算标题文本
        titleText() {
            if(this.activeName == "many"){
                return "动态属性"
            }
            return "静态属性"
        }
    }
}
</script>

<style lang="less">
.cat_opt {
    margin: 20px 0 ;
}
.el-tag {
    margin: 10px;
}
#input-new-tag {
    width: 100px;
    margin-left:5px ;
}

</style>

